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Fix PR9331. Simplified version of a patch by Jakub Staszak.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127243 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2011-03-08 12:39:03 +00:00
parent c61ac5120d
commit 606199fb85
2 changed files with 54 additions and 0 deletions
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4
lib/Analysis/ValueTracking.cpp
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@ -610,6 +610,10 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
// Otherwise take the unions of the known bit sets of the operands,
// taking conservative care to avoid excessive recursion.
if (Depth < MaxDepth - 1 && !KnownZero && !KnownOne) {
// Skip if every incoming value references to ourself.
if (P->hasConstantValue() == P)
break;
KnownZero = APInt::getAllOnesValue(BitWidth);
KnownOne = APInt::getAllOnesValue(BitWidth);
for (unsigned i = 0, e = P->getNumIncomingValues(); i != e; ++i) {